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25 lines
782 B
Plaintext
25 lines
782 B
Plaintext
import semmle.python.dataflow.new.DataFlow
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private import semmle.python.dataflow.new.internal.DataFlowPrivate as DataFlowPrivate
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/**
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* A configuration to find all "maximal" flows.
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* To be used on small programs.
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*/
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class MaximalFlowsConfig extends DataFlow::Configuration {
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MaximalFlowsConfig() { this = "AllFlowsConfig" }
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override predicate isSource(DataFlow::Node node) {
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node instanceof DataFlow::ParameterNode
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or
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node instanceof DataFlow::EssaNode and
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not exists(DataFlow::EssaNode pred | DataFlow::localFlowStep(pred, node))
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}
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override predicate isSink(DataFlow::Node node) {
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node instanceof DataFlowPrivate::ReturnNode
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or
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node instanceof DataFlow::EssaNode and
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not exists(node.(DataFlow::EssaNode).getVar().getASourceUse())
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}
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}
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